The is a popular, low‑cost passive infrared (PIR) motion sensor module. It is frequently rebranded as the HC‑SR501 and is widely used in electronics projects, security systems, automatic lighting, and smart‑home automation. This article compiles all the essential information from the hw‑416‑b pir sensor datasheet and adds practical advice for beginners and experienced makers alike.
Signal output pin. Outputs 3.3V High when motion is detected and 0V Low when idle.
High-frequency electromagnetic radiation from nearby Wi-Fi routers, cellular devices, or ESP8266/ESP32 modules can bleed into the unshielded PIR circuitry. Keep wireless transmitters at least 15–20 cm away from the module. hw-416-b pir sensor datasheet
Controls how long the OUT pin remains HIGH after motion is detected. Turn clockwise to increase the delay time (up to several minutes). Trigger Mode Jumper:
PIR sensors are highly sensitive to ripple voltage on the power rails. If using a noisy power adapter or a switching regulator, add a 100µF electrolytic capacitor across the VCC and GND pins of the sensor to smooth out power spikes. The is a popular, low‑cost passive infrared (PIR)
At the core of the HW‑416‑B is the integrated circuit, a dedicated PIR signal‑processing chip. It takes the tiny signal from the pyroelectric sensor, amplifies it, filters out noise, and produces a clean digital output when motion is detected. This IC is designed for low power consumption and good immunity against radio‑frequency interference.
This article serves as a complete , covering every technical detail you need: electrical characteristics, pin configuration, sensitivity adjustment, time delay settings, wiring diagrams, and troubleshooting tips. Signal output pin
Clockwise rotation increases the detection distance (up to ~7 meters); counter-clockwise rotation decreases the range.